01 - Preheat oven to 350°F.
02 - Cook ramen noodles in boiling water for 2 minutes less than package directions. Drain and set aside.
03 - Heat vegetable oil in a large skillet over medium heat. Add chopped onion, minced garlic, and grated ginger. Sauté for 3 minutes until aromatic and translucent.
04 - Add ground pork to the skillet. Cook until thoroughly browned, breaking into smaller pieces as it cooks.
05 - Stir in gochujang, red pepper flakes, crushed tomatoes, soy sauce, rice vinegar, and sugar. Season with salt and pepper. Simmer for 10 minutes until slightly thickened.
06 - Combine ricotta cheese, egg, half of the mozzarella cheese, and half the parmesan cheese in a bowl. Mix until well incorporated.
07 - Spread a thin layer of meat sauce onto the bottom of a 9x13-inch baking dish.
08 - Add a layer of cooked ramen noodles, arranging approximately one pack to fit the dish.
09 - Spread one-third of the ricotta mixture over noodles, then top with one-third of the meat sauce.
10 - Repeat noodles, cheese mixture, and meat sauce layering twice more, finishing with meat sauce on top.
11 - Sprinkle remaining mozzarella and parmesan evenly over the surface.
12 - Cover with aluminum foil and bake for 20 minutes.
13 - Remove foil and continue baking for 10 to 15 minutes, until the cheese is bubbling and golden brown.
14 - Let stand for 10 minutes before slicing. Garnish with sliced green onions, if desired.